The Boulder County Coroner's Office ruled Friday that 13-year-old Sophia DuBose, who was killed when the truck she was riding in with her father and twin sister careened into Boulder Creek, died due to blunt force trauma and drowning.

Coroner Emma Hall officially ruled the manner of Sophia's death an accident.

Sophia was with her father, Beverly "Bo" Means DuBose IV, and twin sister, Eliza, all of Rollinsville, on May 31 when the truck they were riding in collided with another car that had stopped for a bear in Boulder Canyon.

The truck, which has been identified by Colorado State Patrol as a 2000 Ford F250, crashed into the runoff-swollen creek. The father and sister were able to climb to safety, but Sophia floated several miles downstream before crews were able to reach her.

Although State Patrol officials said DuBose should have been able to stop in time to avoid the accident, Boulder County District Attorney Stan Garnett said he does not plan to file charges against him in the crash.

DuBose has a history of driving violations, including a 2012 DUI arrest with his twin daughters in the car — a case in which he remains on probation — but Garnett said there was no evidence of intoxication in the crash that killed Sophia.

Garnett initially said DuBose underwent a "full battery" of tests, but he said he found out this week that was not the case, and that the State Patrol did not take any tests because DuBose did not appear to be intoxicated.

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